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National security strategy memoranda6/9/2023 (c) “Augmentation” refers to any system that provides users of PNT signals with additional information that enables users to obtain enhanced performance when compared to the un-augmented signals from a primary PNT service alone. A primary PNT service is expected to provide sufficient accuracy, availability, integrity, or other characteristics important to the user. (b) “Primary PNT Service” refers to an independent PNT service chosen by a user or system operator as the preferred source of PNT information. (a) “PNT service” refers to any system, network, or capability that provides a reference to calculate or augment the calculation of longitude, latitude, altitude, or transmission of time or frequency data, or any combination thereof. (c) United States participation in international cooperative initiatives regarding foreign space-based PNT services and foreign use of GPS and its augmentations. (b) implementation and operation of capabilities to protect United States and allied access to and use of GPS for national, homeland, and economic security, and to deny adversaries hostile applications use of United States space-based PNT services and (a) sustainment and modernization of the Global Positioning System (GPS) and federally developed, owned, and operated systems used to augment or otherwise improve GPS This policy directive provides guidance for: This policy supersedes National Security Presidential Directive-39 (NSPD-39) of Decem(United States Space-Based Positioning, Navigation, and Timing Policy). This policy complements the guidance set forth in Executive Order 13905 of Febru(Strengthening National Resilience through Responsible Use of Positioning, Navigation, and Timing Services), and the intersector guidance for Global Navigation Satellite Systems (GNSS) included in the December 9, 2020, National Space Policy. This Space Policy Directive establishes implementation actions and guidance for United States space-based positioning, navigation, and timing (PNT) programs and activities for United States national and homeland security, civil, commercial, and scientific purposes. Space-Based Positioning, Navigation, and Timing SUBJECT: Space Policy Directive 7, The United States THE CHAIRMAN OF THE FEDERAL COMMUNICATIONS THE CHAIRMAN OF THE JOINT CHIEFS OF STAFF THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND THE ASSISTANT TO THE PRESIDENT FOR NATIONAL THE DIRECTOR OF THE OFFICE OF MANAGEMENT AND
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